Question about 1995 Lincoln Mark VIII

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How do I diagnose AC compressor clutch?

The clutch does not engage. Mechanics said Freon level is correct. Where is the relay for the clutch? All high amp fuses in box under hood by power steering pump are all ok. The fuses in the box by drivers door are all ok. There is not a fuse listed for the ac clutch. Can I test the clutch to see if it will operate? The clutch was working perfectly up until it quit 4 days ago. Can I force the clutch to run by providing power to it by jumping across the relay? I haven't yet disconnected the power wires from the clutch to check to see if it is getting voltage. It looks like 3 wires go to the terminal on the clutch.

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How do I diagnose AC compressor clutch? - 25655642-3dirm1gm1qrtmo4wxqoupvjf-2-0.jpg

Posted on Apr 20, 2015

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AC fuse and relay for 2001 Ford Expedition


Pull a relay out and use paper clip to jump. Usually cross corner. Watch compressor clutch and see if engages when key is turn ahead. Don't start car. If it does good. Now take alligator clips and check relay. Clip each wire to negative and positive battery post. Then clip negative to negative relay pin. And touch positive to correct pin. If it doesn't click do it another relay so you know your doing it right. If determined relay is good. And your compressor clutch did engage when testing it. You are low on freon.

Jul 11, 2016 | Ford Cars & Trucks

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I have 2011 Nissan Sentra. Yesterday the a/c worked fine. Today it blows only hot air (compressor not engaging). I checked the freon, it's good. I'm lost.


If your fuses are all ok, there is a good chance the climate control unit has failed (the piece with all of the dials and buttons).

Jul 02, 2016 | Nissan Cars & Trucks

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Ac clutch


fuse could be blown or freon level is low in system. Ac units think of like a basketball with air loss over time likewise in an older ac unit with rubber seals deteriorating low freon level will not allow compressor to engage

May 20, 2012 | Ford Expedition Cars & Trucks

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What's your problem?ac compresor seems like dont recive energy


There are 2 safety switches in most A/C systems. A high and low pressure sensor will cut off the Compressor clutch. You can borrow a gauge set, called Manifold gauges, from tool loaner programs at Autozone, Advance, or Oreilys autoparts.

There are several ways to try to fix this. It depends on what the pressure gauges show.

If the pressure is low, but not empty, there is hope. The old Freon leaked out. It will happen again. But there are products which can plug some leaks. Then add Freon using the gauges. The ideal amount is an amount that makes the compressor stay on the longest. There are gauges that can tell you, color coded, and reasonable priced.

If the system is completely empty, it is contaminated with outside air. The Freon will not function correctly if added and a new Dryer(A/C part) should be installed. There is a Vacuum pump which must be attached to draw down the system to a negative vacuum. So even changing a part will not decontaminate the system without the pump. Pump can be loaned from Autozone with big deposit which is returned, no hassle. Some parts require special pliers and "O" rings to reinstall.

The price of Freon has skyrocketed. What once costed $12 to refill a car now costs $50. So going to a repair shop can be a better idea if you waste Freon doing it yourself. If you don't repair the leak, imagine $50 evaporating into the wind with the Freon.

Apr 14, 2012 | 1994 Buick LeSabre

1 Answer

My a/c compressor is only blowing hot air when I turn it on. I know a little about cars so I know it's the a/c but I am not able to find one on any site that may sell used or new.


If all you get is hot air there are several possibilities. The compressor is driven by the serpentine belt and is engaged and disengaged by an electric clutch mounted on the compressor drive pulley. With the engine running, have an assistant turn on the AC while you observe the AC compressor clutch. If the clutch engages, you can be reasonably sure that the system has freon, and the electric circuit is OK. If the clutch doesn't engage, which is the most likely situation, either you are low on freon, the AC clutch relay is inop, or AC compressor fuse is open (blown). A search of Google images will give you the location of the AC relay. You can pull out the relay, carefully remove the cover, reinsert the relay, and engage the compressor clutch by manually closing the relay contacts. Warning: do this only for a second or two in order to see the clutch engage. If the clutch does engage, then you are probably low on freon. There is a safety switch that prevents the clutch from operating if there is not enough freon in the system. Hopefully, this is the case. Go to Walmart and get two cans of r-134 and the inexpensive kit, and following their instructions, charge your system. If this is not the problem, you'll need a set of AC gauges and the skill to use them. Hope this helps. Dano

Aug 31, 2011 | 1998 Lexus Gs 400

2 Answers

AC not working


The A/C system has a pressure sensor that detects the freon level in the system. If you lost freon, the clutch that engages the compressor will not engage. A good indicator is to turn on the A/C and watch the compressor/clutch assembly. If the pulley is spinning and the clutch is not, odds are you have a freon leak. Good luck!!

Jan 20, 2010 | 1993 Chevrolet Corvette

1 Answer

Ac does not work blowing warm air dealer mentioned compressor & receiver out ? is this a current problem with the 2004 ?


Hi,
With engine running, I would check to see if the compressor clutch is engaging when the AC is turned on. If not, I would first have the freon level checked. If after checking, it is fully charged but not engaging, I would then suspect an AC relay switch.
I hope this helps... Good luck!

Oct 12, 2009 | 2004 Kia Sedona

2 Answers

WHAT ELSE CAN I DO TO GET MY AC IN MY SATURN TO BLOW COLD? IVE ALREADY PUT FREON IN


it have to be checked by a mechanic , putting freon is not enoght , you may have a bad compressor , pluged condenser, or even not puting the right amound of freon

Aug 02, 2009 | Saturn SL2 Cars & Trucks

1 Answer

A/C turns off during operation


I encountered a similar problem not long ago, though it was a freon issue and discovered that it was something totally different when the low port reading was 125psi. Confused at the reading, and inexperienced with AC systems I sought secondary opinions, and disovered a solution to my particular issue. The compressor clutch was not engaging due to a faulty relay, thus the system was not cooling--hence the buildup of pressure on the low port line. Truthfully, there could be a number of things causing your AC to act up, here are some of the things to check first & foremost:

1. AC Compressor Control Relay (defined as "M/G CLT" or Magnetic Clutch Relay) may be failing. This can be located in the electrical box to the right of the battery under the hood.

Turn the car on, set the AC to MAX and let it run for a while. While facing the front of the car, look under the hood on the left side of the engine. Straight down in front you will see the AC Compressor. There is a belt spinning a pulley, and a clutch assembly within that pulley which engages the compressor. Use a flashlight to see if the clutch is engaging. If you find that it cycles on and off, then you could possibly be a bit low on freon..

If you've checked the freon and it's within range, then try swapping the "FOG" relay with the "M/G CLT" relay (DO NOT DO THIS WHILE THE VEHICLE IS RUNNING). After the swap, start the vehicle and set the AC on MAX. Inspect the compressor again to see if the clutch is engaged. If your clutch was not engaging on your prior freon psi check, then check it again while the clutch is engaged and the system is cooling--this will give you the proper reading for your freon levels. If this solves your problem, DO NOT leave the FOG relay in place of the M/G CLT relay. Go to an auto parts store and purchase a new relay--OEM costs about $70.00, standard replacements (which I happen to have part numbers for.. AdvanceAuto: #R6034, or #35874. NAPA: #TEM207703, or ECHAR6034. AutoZone: #MT0610. O'Reilly Auto: #35874) run anywhere from $14.00 to $30.00 depending on where you go, and what quality/warranty you desire.

2. AC Compressor -or- comp clutch may be failing. If the air comes on and cools intermittently and the relay is functioning, then it may be a problem with a slipping belt. Check your tensioner on your serpentine, as well as the belt. Make sure there are no cracks in the belt and that it is tight along its route.

If neither the relay nor the belt are the cause of your problem, then you may possibly want to have your system purged, flushed/cleaned, and recharged... this is the more expensive part of maintaining an AC system.

Hope that solves your problem!

Jun 25, 2009 | 2003 Toyota Matrix

1 Answer

1998 cadillac deville reads service ac system


Hi,check if the compressor clutch is engaging,if not check the conection at the compressor if ok check,fuse ,or relay ,if those are fine and the commpressor is engaging,check freon presure ,may be too high or low, if this is the case ,correct the problem and disconect the negative cable from the battery for a minute to reprogram the sistem..C1

Jan 04, 2009 | 1998 Cadillac DeVille

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